140164021 has 4 divisors (see below), whose sum is σ = 140188000. Its totient is φ = 140140044.

The previous prime is 140164019. The next prime is 140164027. The reversal of 140164021 is 120461041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 120461041 = 29 ⋅4153829.

It is a cyclic number.

It is not a de Polignac number, because 140164021 - 2¹ = 140164019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 140164021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140164027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3160 + ... + 17038.

It is an arithmetic number, because the mean of its divisors is an integer number (35047000).

Almost surely, 2^140164021 is an apocalyptic number.

It is an amenable number.

140164021 is a deficient number, since it is larger than the sum of its proper divisors (23979).

140164021 is a wasteful number, since it uses less digits than its factorization.

140164021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23978.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 140164021 is about 11839.0886895909. The cubic root of 140164021 is about 519.4521115396.

The spelling of 140164021 in words is "one hundred forty million, one hundred sixty-four thousand, twenty-one".